Blocks specifically used to make Nether portal

While I was playing Minecraft I noticed how easy is to get to the Nether, usually, you don't even need a diamond pickaxe to do it. I believe it should be more challenging to reach Nether in order to obtain new unique resources and make progress on the game. I would suggest introducing these additions to make the game a little bit more challenging:

- Empty Nether Portal Frame

A block is used for building the Nether portal like we used to build the same portal with Obsidian earlier. It would be crafted with obsidian and iron ingots.

This block would be placeable and it would be possible to get it back with a diamond or netherite pickaxe when misplaced.

Would have similar block properties as obsidian.

- Active Nether Portal Frame

Same design as the previous block, but a little soul is visible inside and emits light.

When pressing right-click on Empty Nether Portal while holding the item Bottle o' Soul, Empty Nether Portal turns into Active Nether Portal Frame.

When destroyed, this block drops the Empty Nether Portal Frame as we release the soul out of the cage while breaking this block.

Constructing a Nether Portal structure with these blocks will light up the portal.

- Soul

It's a new mob that has a small chance to spawn upon the death of a hostile mob. Does not hurt the player and can be caught with a bottle. Despawns after a short time if the mob is ignored by the player.

- Bottle o' Soul

Item obtained when Soul mob is cached with an empty bottle.

Used to activate the Nether Portal Frame.